Nannotax3 - ntax_mesozoic - Broinsonia enormis Nannotax3 - ntax_mesozoic - Broinsonia enormis

Broinsonia enormis


Classification: ntax_mesozoic -> Arkhangelskiales -> Arkhangelskiellaceae -> Broinsonia -> Broinsonia enormis
Sister taxa: B. parca, B. enormis, B. furtiva, B. gammation ⟩⟨ B. verecundia, B. dentata, B. cenomanica ⟩⟨ B. ethmoquadrata ⟩⟨ B. signata, B. galloisii, B. matalosa, B. viriosa, B. sp.

Distinguishing features:
Parent taxon (Broinsonia): Outer rim of V-units, with slight clockwise obliquity, visible on distal surface and form dark rim in LM; central-area spanned by an axial cross, grill or perforate plate. 3 tiers visible in side view.
This taxon: Medium-sized (<9 µm); central structure imperforate plate; rim broad


Taxonomy:

Citation: Broinsonia enormis (Shumenko, 1968) Manivit, 1971
taxonomic rank: Species
Basionym: Arkhangelskiella enormis Shumenko, 1968
Synonyms:
Variants: Aspidolithus latus Noel, 1969 = Broinsonia lata (Noel, 1969) Noel 1970 - wider central area
Taxonomic discussion: The 9 µm size separation from B. parca follows Linnert et al. (2014)

Farinacci & Howe catalog pages: A. enormis * , B. bevieri * , A. angustus * , A. latus *

Distinguishing features:
Parent taxon (Broinsonia): Outer rim of V-units, with slight clockwise obliquity, visible on distal surface and form dark rim in LM; central-area spanned by an axial cross, grill or perforate plate. 3 tiers visible in side view.
This taxon: Medium-sized (<9 µm); central structure imperforate plate; rim broad


Morphology:

The absence of pores in the plate may be diagenetic, and so separation from B. furtiva is tenuous,  as discussed by Thierstein (1974).


Phylogenetic relations

Grades into B. parca

Search data:
LITHS: placolith, elliptical, CA: plate, closed, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
Lith size: 5->9µm;
Data source notes: original descriptions & illustrated specimens
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within Maastrichtian Stage (66.04-72.17Ma, top in Maastrichtian stage). Data source: Burnett 1998
First occurrence (base): within Albian Stage (100.50-113.20Ma, base in Albian stage). Data source: Burnett 1998

Plot of occurrence data:

References:

Bown, P. R. (2005c). Early to Mid-Cretaceous Calcareous Nannoplankton from the Northwest Pacific Ocean, Leg 198, Shatsky Rise. Proceedings of the Ocean Drilling Program, Scientific Results. 198: 1-82. gs O

Bukry, D. (1969). Upper Cretaceous coccoliths from Texas and Europe. University of Kansas Paleontological Contributions, Articles. 51 (Protista 2): 1-79. gs O

Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 132-199. gs O

Crux, J. A. (1980). A biostratigraphical study of Upper Cretaceous nannofossils from South-east England and North France. PhD thesis, University College London. -. gs

Gale, A. S., Kennedy, W. J., Burnett, J. A., Caron, M. & Kidd, B. E. (1996). The Late Albian to Early Cenomanian succession at Mont Risou, near Rosans (Drôme, SE France): an integrated study (ammonites, inoceramids, planktonic foraminifera, nannofossils, oxygen and carbon isotopes). Cretaceous Research. 17: 515-606. gs

Hardas, P. & Mutterlose, J. (2007). Calcareous nannofossil assemblages of Oceanic Anoxic Event 2 in the equatorial Atlantic: Evidence of an eutrophication event. Marine Micropaleontology. 66: 52-69. gs

Kanungo, S., Bown, P. R. & Gale, A. S. (2020). Cretaceous (Albian-Turonian) calcareous nannofossil biostratigraphy of the onshore Cauvery Basin, southeastern India. Cretaceous Research. 118 [2021]: 1-22. gs

Linnert, C., Mutterlose, J. & Erbacher, J. (2010). Calcareous nannofossils of the Cenomanian/Turonian boundary interval from the Boreal Realm (Wunstorf, northwest Germany). Marine Micropaleontology. 74: 38-58. gs

Linnert, C., Mutterlose, J. & Bown, P. R. (2014). Biometry of Upper Cretaceous (Cenomanian–Maastrichtian) coccoliths–a record of long-term stability and interspecies size shifts. Revue de Micropaléontologie. 57(4): 125-140. gs

Manivit, H. (1971). Nannofossiles calcaires du Crétacé francais (Aptien-Maestrichtien). Essai de Biozonation appuyée sur les stratotypes. PhD thesis, Université de Paris. -. gs

Noël, D. (1969). Arkhangelskiella (coccolithes Crétacés) et formes affines du Bassin de Paris. Revue de Micropaléontologie. 11: 191-204. gs

Noël, D. (1970). Coccolithes Crétacés: La Craie Campanienne du Bassin de Paris. Éditions du Centre National de la Recherche Scientifique, Paris. -. gs

Perch-Nielsen, K. (1984). Validation of new combinations. INA Newsletter. 6(1): 42-46. gs

Pospichal, J. J. & Wise, S. W. (1990). Maestrichtian calcareous nannofossil biostratigraphy of Maud Rise ODP leg 113 sites 689 and 690, Weddell Sea. Proceedings of the Ocean Drilling Program, Scientific Results. 113: 465-487. gs

Roth, P. H. & Thierstein, H. R. (1972). Calcareous nannoplankton: Leg 14 of the Deep Sea Drilling Project. Initial Reports of the Deep Sea Drilling Project. 12: 546-559. gs O

Shumenko, S. I. (1968). Ontogeny, variation and taxonomy of fossil coccolithophorids as revealed by electron microscope. Paleontological Journal. 2(4): 464-470. gs

Thibault, N. (2010). Calcareous nannofossils from the boreal Upper Campanian- Maastrichtian chalk of Denmark. Journal of Nannoplankton Research. 31(1): 39-56. gs

Thierstein, H. R. (1974). Calcareous nannoplankton - Leg 26, Deep Sea Drilling Project. Initial Reports of the Deep Sea Drilling Project. 26: 619-667. gs

Verbeek, J. W. (1977). Calcareous nannoplankton biostratigraphy of Middle and Upper Cretaceous deposits in Tunisia, southern Spain and France. Utrecht Micropaleontological Bulletin. 16: 1-157. gs O

Wise, S. W. & Wind, F. H. (1977). Mesozoic and Cenozoic calcareous nannofossils recovered by DSDP Leg 36 drilling on the Falkland Plateau, south-west Atlantic sector of the Southern Ocean. Initial Reports of the Deep Sea Drilling Project. 36(269-491): -. gs O


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Broinsonia enormis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 2-3-2024

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10121 Go to Archive.is to create a permanent copy of this page - citation notes
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